The invention discloses a commutator segment manufacturing method. The method is characterized by including the steps of a, drawing copper wire materials; b, cutting off at fixed length; c, flatly pre-heading the head of a profile for the first time through first cold heading, and heading a hanging groove in parts below the tops of the left and right sides of a commutator segment body; d, flatly heading the head of the profile for the second time through second cold heading by using the hanging groove as the positioning benchmark, wherein the top of the hanging groove extends upwardly; e, flatly heading the head of the profile for the third time through third cold heading by using the hanging grooves as the positioning benchmark, and forming steps, wherein the forming size of the commutator segment body is slightly larger than the actual size; f, fourth cold heading is used to push a workpiece into a die cavity and allow the workpiece to come out from the discharge outlet in the front side of the bottom of the die cavity by using the hanging groove as the benchmark so as to allow the top of the hanging groove to penetrate the commutator segment body, forming a commutator segment body groove, and using a shaping port formed in the inner wall of the die cavity to shape the commutator segment body and the steps to allow the commutator segment body and the steps reach the actual sizes. The method has the advantages that the commutator segment body of the commutator segment formed by the method is flat and free of warpage and high in forming precision, and the quality of the manufactured commutator is increased.